Compensating superheater



Dec. 31,1935. w, GORDON 2,026,126

COMPENSATING SUPERHEATER Filed June 26, 1954 L 5.? 5 5 fir- INVENTOR [AW/P155 W GORDON ATTORNEY Patented Dec. 31, 1935 COMPENSATING SWERHEATER Gharles W. Gordon, Munster, Ind, assignor to The superheater Company, New York, N. Y.

Application June 26, 1934, Serial No. 732,424

3 Claims.

My invention relates to the art of generating and superheating steam and aims to provide superheating arrangements suitable for water tube boilers of the straight tube type adapted to yield 5 superheated steam having not more than slight variations in temperature over a wide range of load, my present invention being subsidiary to that disclosed in my prior application, Ser. No.

580,290, filed December 11,1931.

In order that my invention, together with its objects and advantages, may be fully and readily understood, I will now describe in detail and by Way of example, the superheater boiler illustrated in the accompanying drawing, such illustrated boiler having been selected by way of example from a number of possible embodiments of the invention.

The single figure of the drawing is an elevation of a straight tube superheater boiler in accordance with my invention.

In the arrangement illustrated, I0 is a boiler of a Well-known type having a transverse steam and water drum I2 and two banks of generating tubes I4 and I6 respectively, one spaced vertically above theother so as to provide an interdeck chamber IS. The usual downcomers 20, headers 22, 22 and 24, 24, together with nipples 26 and 28 and circulators 30 are all provided sothat the thermal circulation shall be set up in 30 boiler I 6 when the tubes in banks I4 and I6 are in contact with heating gases.

Within the chamber I8 is a superheater 32 having a plurality of serpentine tubular units one of which appears at 34, said units being connected 35 in parallel between inlet headers 36 and outlet header 38. superheater 32 is shown as occupying a large portion of the chamber I8, units 34 running almost the entire length of such chamber and taking up the greater part of its height.

40 A bafile 46 extends along the lower edge of chamber I8 for a portion of the length of bank I4, such baffle being shown as beginning at the lower set of headers 24 and extending nearly horizontally but somewhat upwardly for a portion of the length of such bank so that space is left at 42 for the gases to pass into the chamber I8. Another baflle 44 is provided also, baffie 44 having a section 46 along the upper face of the chamber I8 parallel to bafile 40 but spaced at both ends from the headers 22, 22 of the upper bank I6. From the lower end of the section 46,

baffle 44 extends upwardly to the point above bank I6 and preferably to the up-takes of the boiler.

Battle 44 is shown vertically throughout most of the height of the bank I6, but I do not limit myself to this. The upwardly extending portion of baiile 44 is however, in a plane transverse to the tubes of bank I6 throughout such bank so that it separates the surfaces of the generating tubes of bank I6 into two portions but such por- 5 tions have almost the same number of vertical rows of tubes on opposite sides of baffle 44. At the upper end of bafile 44, two uptakes 48, 48 are provided and dampers 53, 53 are shown arranged to control the flow of gases through such uptakes, l0

dampers 50 having individual operating means 52, 52 whereby the operatives divide the gases flowing to the stack into any desired proportion between the two uptakes 48. I prefer also to provide a bafile 54 having a section running down- 15 wardly along the top of bank I6 from the headers 22 for a, certain distance and another section running upwardly to one of the uptakes 48. However, I do not limit myself to this.

It will be seen that gases enter chamber I8 20 through the opening 42 and are free to pass to one of the outlets 48 through either of two paths 53 and 53, path 53' extending substantially horizontally from the opening 42 through chamber I8 between bafiles 40 and section 46 of balile 44 25 and thence upwardly at the right of bafile 44 and path 53 passing directly upward from the opening 42 across the chamber I8 and into and across the bank I6 on the left of baffle 44 and so tothe other outlet or uptake 48. It will be seen that the baffling and the superheater 32 are relatively so arranged that gases passing through path 53, in spite of the uninterrupted longitudinal extent of units 34, flow over a much greater portion of the superheater surface than those which go more directly upward to the left of the vertical section of baflie 44 in path 53. It follows that, for a given total flow of gases and of steam, the final temperature of steam delivered from superheater 32 can be varied within considerable limits by changing the positions of the dampers 50 to throw a greater or less percentage of the gases through path 53 to the right of bafile 44. Therefore the arrangement illustrated can be utilized at low loads to maintain the desired final superheat temperature, the arrangement illustrated being one in which the steam temperature falls ofi with decrease in load with equal distribution of the gases over all portions of the superheater a0 32.

While I have disclosed my invention as embodied in the straight horizontal water tube type,

I do not limit myself to this in all cases as certain features of my invention are equally appli- 55 cable to bent tube boilers and to vertical or semivertical boilers.

What I claim is:

1. The combination of a water tube boiler having two groups of generating tubes one spaced behind the other in the direction of gas flow, a superheater in the space between said groups, means forming a pair of gas paths in parallel within said boiler, one of said paths including at least a considerable portion of the length of the space between said groups and the other of said paths including a portion of the length of the one of said groups farther from the furnace and openinginto said space opposite the point at which the gases enter such space, said superheater having units each extending substantially entirely in the space between said groups and having its major portion only in one of said paths but having a substantial portion in such position as to contact the gases flowing in the other of said paths, and damper means whereby the percentage amounts of gases flowing in said paths may be varied as desired.

2. In a boiler, the combination of two vertically spaced groups of steam generating tubes inclined somewhat from the horizontal and extendin from front to back, means defining two parallel gas paths each extending from one side of the boiler to the other, said means including opposed parallel bafiies in the two groups so arranged as to force the gases flowing through one of the paths to flow through a portion of the space between the groups in a direction generally parallel to the tubes, a superheater arranged within the space between the groups its major portion lying in the path comprising the portion between said bafiies and a minor portion lying in the other path, and damper means whereby the distribution of the gases between the two paths can be varied.

3. In a boiler, the combination of a bank of steam generating tubes inclined somewhat from the horizontal and extending from the front to the rear of the boiler, a battle at the top of the bank and extending from one end of the boiler to a point short of the other end, a second bafiie above the first one and parallel to it and extending from a point spaced from the front to a point spaced from the rear of the boiler, a superheater extending through the space between the bafiies and substantially to the front and to the rear of the boiler, whereby gases may flow between the end of the first battle and the end of the boiler and a part of such gases may flow over a part of the superheater and away around one end of the second baffle and the remainder over the remainder of the superheater and away around the other end of the second bafiie, and damper means to control the relative amount of the gases around the two ends of the second bafile.

CHARLES W. GORDON. 

